Fig. 8From: Infrared spectroscopy reveals the reactivity of fatty acids on copper surfaces and its implications for cultural heritage objectsSpectra zoomed in the region 1750–400 cm−1, of azelaic acid (C9di) at various time intervals after deposition on a pure copper surface and b copper-zinc alloy surface. Lower part in each image: clean/polished surfaces; upper part: mildly corroded surfacesBack to article page